EP0143102B1 - Verfahren zur Herstellung von flüssigem Roheisen oder Stahlvorprodukten sowie Vorrichtung zur Durchführung des Verfahrens - Google Patents
Verfahren zur Herstellung von flüssigem Roheisen oder Stahlvorprodukten sowie Vorrichtung zur Durchführung des Verfahrens Download PDFInfo
- Publication number
- EP0143102B1 EP0143102B1 EP84890154A EP84890154A EP0143102B1 EP 0143102 B1 EP0143102 B1 EP 0143102B1 EP 84890154 A EP84890154 A EP 84890154A EP 84890154 A EP84890154 A EP 84890154A EP 0143102 B1 EP0143102 B1 EP 0143102B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluidized bed
- ferrous material
- gas
- process according
- gasifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims description 18
- 229910000805 Pig iron Inorganic materials 0.000 title claims description 6
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 229910000831 Steel Inorganic materials 0.000 title claims description 4
- 239000007788 liquid Substances 0.000 title claims description 4
- 239000010959 steel Substances 0.000 title claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 37
- 239000007789 gas Substances 0.000 claims description 35
- 230000009467 reduction Effects 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 14
- 239000003245 coal Substances 0.000 claims description 11
- 239000000571 coke Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 239000002893 slag Substances 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000012159 carrier gas Substances 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 238000002309 gasification Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000000446 fuel Substances 0.000 claims description 4
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 4
- 238000011946 reduction process Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 3
- 239000001095 magnesium carbonate Substances 0.000 claims description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 3
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims 2
- 230000004907 flux Effects 0.000 claims 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims 1
- 239000010419 fine particle Substances 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 description 20
- 239000011593 sulfur Substances 0.000 description 20
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 19
- 229910052742 iron Inorganic materials 0.000 description 16
- 230000001914 calming effect Effects 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 150000003463 sulfur Chemical class 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
- C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
- C21B13/002—Reduction of iron ores by passing through a heated column of carbon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/42—Sulphur removal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/66—Heat exchange
Definitions
- the invention relates to a process for the production of molten pig iron or intermediate steel products from particulate iron-containing material, in particular pre-reduced iron sponge, and for the production of reducing gas in a melter gasifier, a fluidized bed zone being added by adding coal and by blowing in oxygen-containing gas by means of nozzle pipes passing through the wall of the melter gasifier (Fluidized bed) is formed from coke particles into which the iron-containing material to be reduced is introduced, and a device for carrying out the method.
- a method of this type is described in DE-OS 28 43 303, wherein the oxygen-containing gas or pure oxygen above the metal sump formed or the slag layer covering it is blown through a ring of nozzle pipes passing through the wall of the melter gasifier.
- the particulate iron-containing material, in particular pre-reduced iron sponge, and the lumpy coal are fed from above through charging openings in the hood of the melter gasifier, the falling particles are decelerated in the fluidized bed and the iron-containing particles are reduced and melted during falling through the coke fluid bed.
- the molten metal covered with slag collects at the bottom of the melter. Metal and slag are removed through separate tap holes.
- metallurgical coke has a sulfur content of 0.7 to 0.6%.
- this sulfur remains largely in the slag in the blast furnace process and does not lead to a strong sulfurization of the pig iron.
- pig iron is produced on the basis of a direct coal reduction process, as in the process described in the introduction, considerably higher sulfur contents are to be expected than in blast furnace metallurgy.
- the invention aims to avoid the difficulties or disadvantages described and has as its object to be able to produce molten pig iron or molten steel intermediate products in a direct reduction process with a lower sulfur content than was previously the case; the method is particularly advantageous for combined pre-reduction melter gasification plants, in which one or more reduction shafts cooperate with a melter gasifier, with the proviso that the sulfur content of the coal to be used has no special requirements.
- the particulate iron-containing material is fed through charging tubes which pass through the wall of the melter gasifier and open into the fluidized bed.
- a further preferred embodiment consists in that the reducing gas formed in the reaction is passed through one or more cyclones for the separation of dust-like constituents and the dust-like particles separated thereby are fed back into the melting-gas gasifier through charging tubes which flow through the wall of the melting gasifier and open at the level of the fluidized bed .
- This measure is based on the knowledge that the sulfur is mainly contained in the dusts carried by the reducing gas, u. mostly as CaS. If the sulfur-containing dusts are passed together with the reducing gas for the pre-reduction into an upstream pre-reduction shaft, the material contained in the reduction shaft in the form of pellets, lumpy ore, etc. has a filtering effect in that the sulfur-containing dusts are retained and are quantitatively absorbed by the bed . You then go back to the melter with the pre-reduced material. A sulfur equilibrium is established, with the result that a larger proportion of sulfur gets into the molten metal. If, however, as proposed according to the invention, the dusts are separated off and fed directly to the fluidized bed, this earlier disadvantageous sequence no longer occurs.
- a desulfurization effect can also be achieved by subjecting the reducing gas formed in the reaction to desulfurization before it is used as a reducing agent in a pre-reduction process preceding the melt-down gasification.
- desulfurization can be done by passing the reducing gas through a desulfurization tower with lumpy desulfurizing agent such as lime.
- a further advantageous embodiment consists in that lime and / or magnesium-containing additives, such as dolomite, magnesite, calcium oxide, magnesium oxide or mixtures thereof, are blown in in finely divided form through further charging tubes opening in the region of the fluidized bed.
- This embodiment which also aims at reducing the sulfur content in the molten iron, is based on the fact that, in the presence of lime and directly reduced iron, the sulfur preferably combines with lime in the temperature range above 900 ° C.
- the lime, dolomite or magnesite dust can either be blown in simultaneously with the oxygen-containing carrier gas or by means of separate charging pipes.
- a fixed bed zone is provided below the fluidized bed, which zone is preferably kept at a higher temperature than the melting temperature of the iron-containing material.
- the invention further comprises a device consisting of a refractory lined melter with openings for the addition of coal or other solid carbon-containing fuels, iron-containing material and for the extraction of the generated reducing gas, further with openings for slag and melt tapping, a lower one Section for collecting the molten metal and the liquid slag, a middle section for receiving a coke fluidized bed and then an upper section as a calming space, and in the lower area of the middle section nozzle pipes penetrating the wall of the melter gasifier for introducing oxygen-containing carrier gas and possibly fuels are provided for the formation of the fluidized bed, which device is characterized in that C which penetrates the wall of the melting gasifier just above the plane formed by the nozzle tubes in the region of the fluidized bed zone Hargierrohre are provided for the introduction of the iron-containing material to be melted and for the introduction of dusts separated from the reducing gas and optionally of additives containing calcium or magnesium oxide or carbonate.
- a refractory-lined melter gasifier which has a lower section A, a middle section B and an upper section C with a larger diameter.
- the lower section A is intended for collecting molten metal, slag and an overlying fixed bed of coke particles
- the middle section B for the formation of the fluidized bed from coke particles and an oxygen-containing carrier gas
- the upper section C serves as a calming space for the reducing gas which forms .
- An opening 3 for introducing coal particles is provided in the hood 2 of the melter gasifier 1. Furthermore, openings 4 and 5 are provided in the hood for discharging the resulting reducing gas.
- the melter gasifier shown in the drawing diagram works with two pre-reduction shafts 6 and 7 and is connected to them by lines 8, 9. A cyclone 10, 11 is switched on in each of these connecting lines 8, 9 for dust separation, the dedusted gas being introduced through lines 12, 13 into the pre-reduction shafts in the lower part thereof.
- the reducing gas formed during the reduction is dedusted from the openings 4 and 5 in the cyclones 10, 11 after passing through the calming space C. As already mentioned, the dedusted gas is introduced into the pre-reduction shafts 6, 7. The separated dust is returned from the bottoms of the cyclones through lines 24, 25 to fluidized bed zone 26.
- the liquid iron formed during the reduction collects in the bottom part of the melting gasifier and forms a sump 28 which is covered by a slag layer 29.
- Metal and slag are discharged through tap openings 30, 31.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT2953/83 | 1983-08-18 | ||
AT0295383A AT382165B (de) | 1983-08-18 | 1983-08-18 | Verfahren zur herstellung von fluessigem roheisen oder stahlvorprodukten sowie vorrichtung zur durchfuehrung des verfahrens |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0143102A1 EP0143102A1 (de) | 1985-05-29 |
EP0143102B1 true EP0143102B1 (de) | 1987-05-27 |
Family
ID=3542989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84890154A Expired EP0143102B1 (de) | 1983-08-18 | 1984-08-13 | Verfahren zur Herstellung von flüssigem Roheisen oder Stahlvorprodukten sowie Vorrichtung zur Durchführung des Verfahrens |
Country Status (12)
Country | Link |
---|---|
US (1) | US4725308A (pt) |
EP (1) | EP0143102B1 (pt) |
JP (1) | JPS6059008A (pt) |
AT (1) | AT382165B (pt) |
AU (1) | AU560040B2 (pt) |
BR (1) | BR8404124A (pt) |
CA (1) | CA1228234A (pt) |
CS (1) | CS244826B2 (pt) |
DD (1) | DD223468A5 (pt) |
DE (1) | DE3463947D1 (pt) |
SU (1) | SU1436888A3 (pt) |
ZA (1) | ZA846404B (pt) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT381116B (de) * | 1984-11-15 | 1986-08-25 | Voest Alpine Ag | Verfahren zur herstellung von fluessigem roheisen oder stahlvorprodukten sowie vorrichtung zur durchfuehrung des verfahrens |
DE3603894A1 (de) * | 1986-02-05 | 1987-08-06 | Korf Engineering Gmbh | Verfahren zur herstellung von fluessigem roheisen oder stahlvormaterial |
ATE89320T1 (de) * | 1987-02-16 | 1993-05-15 | Mo I Stali I Splavov | Verfahren und ofen zur herstellung von zwischenprodukten aus eisen-kohlenstoff fuer die stahlerzeugung. |
DE3787017T2 (de) * | 1987-06-30 | 1993-11-25 | Kawasaki Steel Co | Verfahren und Vorrichtung zur Erzeugung von flüssigem Metall von Erzpartikeln. |
DE4108283A1 (de) * | 1991-03-14 | 1992-09-17 | Kortec Ag | Verfahren zum herstellen von fluessigem metall aus feinkoernigen metalloxidpartikeln und reduktions- und schmelzofen zur durchfuehrung des verfahrens |
US5429658A (en) * | 1992-10-06 | 1995-07-04 | Bechtel Group, Inc. | Method of making iron from oily steel and iron ferrous waste |
US5259864A (en) * | 1992-10-06 | 1993-11-09 | Bechtel Group, Inc. | Method of disposing of environmentally undesirable material and providing fuel for an iron making process e.g. petroleum coke |
US5354356A (en) * | 1992-10-06 | 1994-10-11 | Bechtel Group Inc. | Method of providing fuel for an iron making process |
US5380352A (en) * | 1992-10-06 | 1995-01-10 | Bechtel Group, Inc. | Method of using rubber tires in an iron making process |
US5397376A (en) * | 1992-10-06 | 1995-03-14 | Bechtel Group, Inc. | Method of providing fuel for an iron making process |
US5320676A (en) * | 1992-10-06 | 1994-06-14 | Bechtel Group, Inc. | Low slag iron making process with injecting coolant |
US5338336A (en) * | 1993-06-30 | 1994-08-16 | Bechtel Group, Inc. | Method of processing electric arc furnace dust and providing fuel for an iron making process |
US6197088B1 (en) | 1992-10-06 | 2001-03-06 | Bechtel Group, Inc. | Producing liquid iron having a low sulfur content |
US5558696A (en) * | 1993-12-15 | 1996-09-24 | Bechtel Group, Inc. | Method of direct steel making from liquid iron |
GB2281311B (en) * | 1993-03-29 | 1996-09-04 | Boc Group Plc | Metallurgical processes and apparatus |
US5958107A (en) * | 1993-12-15 | 1999-09-28 | Bechtel Croup, Inc. | Shift conversion for the preparation of reducing gas |
DE19634348A1 (de) | 1996-08-23 | 1998-02-26 | Arcmet Tech Gmbh | Einschmelzaggregat mit einem Lichtbogenofen |
AT404022B (de) * | 1996-11-08 | 1998-07-27 | Voest Alpine Ind Anlagen | Verfahren und anlage zur herstellung von flüssigem roheisen oder stahlvorprodukten aus eisenhältigemmaterial |
US7238222B2 (en) * | 2005-03-01 | 2007-07-03 | Peterson Oren V | Thermal synthesis production of steel |
AT511738B1 (de) | 2011-07-21 | 2013-04-15 | Siemens Vai Metals Tech Gmbh | Schmelzreduktionsaggregat und verfahren zum betrieb eines schmelzreduktionsaggregats |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1086256B (de) * | 1952-07-23 | 1960-08-04 | Werner Wenzel Dr Ing | Verfahren und Einrichtung zur Eisengewinnung aus staubfoermigen bzw. feinkoernigen Eisenerzen mittels Brennstoffen in feinem Verteilungsgrad oberhalb des Schmelzpunktes der nicht gasfoermigen Reaktionsprodukte |
US2781255A (en) * | 1955-11-16 | 1957-02-12 | Union Carbide & Carbon Corp | Treatment of fumes containing suspended solids |
FR1243733A (fr) * | 1959-01-01 | 1960-10-14 | British Iron Steel Research | Procédé de réduction des minerais métallifères, en particulier des minerais de fer pour la production du fer |
DE1267692B (de) * | 1960-08-10 | 1968-05-09 | E H Hermann Schenck Dr Ing Dr | Verfahren zur Reduktion von Metalloxyden mit Kohle im Wirbelbett |
SE388210B (sv) * | 1973-01-26 | 1976-09-27 | Skf Svenska Kullagerfab Ab | Sett vid reduktion av metall ur metalloxider |
US3948645A (en) * | 1973-04-30 | 1976-04-06 | Boliden Aktiebolag | Method of carrying out heat-requiring chemical and/or physical processes in a fluidized bed |
US4173465A (en) * | 1978-08-15 | 1979-11-06 | Midrex Corporation | Method for the direct reduction of iron using gas from coal |
DE2843303C2 (de) * | 1978-10-04 | 1982-12-16 | Korf-Stahl Ag, 7570 Baden-Baden | Verfahren und Anlage zur Erzeugung von flüssigem Roheisen und Reduktionsgas in einem Einschmelzvergaser |
DE3273996D1 (en) * | 1981-04-28 | 1986-12-04 | Kawasaki Steel Co | Methods for melting and refining a powdery ore containing metal oxides and apparatuses for melt-refining said ore |
SE457265B (sv) * | 1981-06-10 | 1988-12-12 | Sumitomo Metal Ind | Foerfarande och anlaeggning foer framstaellning av tackjaern |
-
1983
- 1983-08-18 AT AT0295383A patent/AT382165B/de not_active IP Right Cessation
-
1984
- 1984-07-24 AU AU31107/84A patent/AU560040B2/en not_active Ceased
- 1984-07-30 CA CA000459997A patent/CA1228234A/en not_active Expired
- 1984-08-10 JP JP59168735A patent/JPS6059008A/ja active Granted
- 1984-08-13 DE DE8484890154T patent/DE3463947D1/de not_active Expired
- 1984-08-13 EP EP84890154A patent/EP0143102B1/de not_active Expired
- 1984-08-13 CS CS846116A patent/CS244826B2/cs unknown
- 1984-08-15 SU SU843781300A patent/SU1436888A3/ru active
- 1984-08-16 DD DD84266332A patent/DD223468A5/de not_active IP Right Cessation
- 1984-08-17 ZA ZA846404A patent/ZA846404B/xx unknown
- 1984-08-17 BR BR8404124A patent/BR8404124A/pt not_active IP Right Cessation
-
1986
- 1986-06-18 US US06/876,305 patent/US4725308A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
AU560040B2 (en) | 1987-03-26 |
CS611684A2 (pt) | 1985-09-17 |
ATA295383A (de) | 1986-06-15 |
AT382165B (de) | 1987-01-26 |
ZA846404B (en) | 1985-04-24 |
JPH0357162B2 (pt) | 1991-08-30 |
DE3463947D1 (en) | 1987-07-02 |
EP0143102A1 (de) | 1985-05-29 |
CS244826B2 (en) | 1986-08-14 |
AU3110784A (en) | 1985-02-21 |
JPS6059008A (ja) | 1985-04-05 |
BR8404124A (pt) | 1985-07-16 |
SU1436888A3 (ru) | 1988-11-07 |
US4725308A (en) | 1988-02-16 |
CA1228234A (en) | 1987-10-20 |
DD223468A5 (de) | 1985-06-12 |
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